package com.xindao.other;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;

public class LunarCalendar {
  private int year;
  private int month;
  private int day;
  private Calendar cal;
  private boolean leap;
  final static String chineseNumber[] = { "正", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "腊" };
//  final static String chineseNumber1[] = { "一", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "十二" };
  final static String chineseYear[] = {"零", "一", "二", "三", "四", "五", "六", "七", "八", "九"};
  final static String chineseDay[] = {"", "一", "二", "三", "四", "五", "六", "七", "八", "九"};
  final static String[] WEEK = {"", "日", "一", "二", "三", "四", "五", "六"};
  SimpleDateFormat chineseDateFormat = new SimpleDateFormat("yyyy年MM月dd日", Locale.CHINA);
  final static long[] lunarInfo = new long[] { 0x04bd8, 0x04ae0, 0x0a570, 0x054d5, 0x0d260, 0x0d950, 0x16554, 0x056a0, 0x09ad0, 0x055d2, 0x04ae0, 0x0a5b6, 0x0a4d0, 0x0d250, 0x1d255, 0x0b540, 0x0d6a0,
      0x0ada2, 0x095b0, 0x14977, 0x04970, 0x0a4b0, 0x0b4b5, 0x06a50, 0x06d40, 0x1ab54, 0x02b60, 0x09570, 0x052f2, 0x04970, 0x06566, 0x0d4a0, 0x0ea50, 0x06e95, 0x05ad0, 0x02b60, 0x186e3, 0x092e0,
      0x1c8d7, 0x0c950, 0x0d4a0, 0x1d8a6, 0x0b550, 0x056a0, 0x1a5b4, 0x025d0, 0x092d0, 0x0d2b2, 0x0a950, 0x0b557, 0x06ca0, 0x0b550, 0x15355, 0x04da0, 0x0a5d0, 0x14573, 0x052d0, 0x0a9a8, 0x0e950,
      0x06aa0, 0x0aea6, 0x0ab50, 0x04b60, 0x0aae4, 0x0a570, 0x05260, 0x0f263, 0x0d950, 0x05b57, 0x056a0, 0x096d0, 0x04dd5, 0x04ad0, 0x0a4d0, 0x0d4d4, 0x0d250, 0x0d558, 0x0b540, 0x0b5a0, 0x195a6,
      0x095b0, 0x049b0, 0x0a974, 0x0a4b0, 0x0b27a, 0x06a50, 0x06d40, 0x0af46, 0x0ab60, 0x09570, 0x04af5, 0x04970, 0x064b0, 0x074a3, 0x0ea50, 0x06b58, 0x055c0, 0x0ab60, 0x096d5, 0x092e0, 0x0c960,
      0x0d954, 0x0d4a0, 0x0da50, 0x07552, 0x056a0, 0x0abb7, 0x025d0, 0x092d0, 0x0cab5, 0x0a950, 0x0b4a0, 0x0baa4, 0x0ad50, 0x055d9, 0x04ba0, 0x0a5b0, 0x15176, 0x052b0, 0x0a930, 0x07954, 0x06aa0,
      0x0ad50, 0x05b52, 0x04b60, 0x0a6e6, 0x0a4e0, 0x0d260, 0x0ea65, 0x0d530, 0x05aa0, 0x076a3, 0x096d0, 0x04bd7, 0x04ad0, 0x0a4d0, 0x1d0b6, 0x0d250, 0x0d520, 0x0dd45, 0x0b5a0, 0x056d0, 0x055b2,
      0x049b0, 0x0a577, 0x0a4b0, 0x0aa50, 0x1b255, 0x06d20, 0x0ada0 };

  // ====== 传回农历 y年的总天数
  final private static int yearDays(int y) {
    int i, sum = 348;
    for (i = 0x8000; i > 0x8; i >>= 1) {
      if ((lunarInfo[y - 1900] & i) != 0) sum += 1;
    }
    return (sum + leapDays(y));
  }

  // ====== 传回农历 y年闰月的天数
  final private static int leapDays(int y) {
    if (leapMonth(y) != 0) {
      if ((lunarInfo[y - 1900] & 0x10000) != 0) return 30;
      else
        return 29;
    } else
      return 0;
  }

  // ====== 传回农历 y年闰哪个月 1-12 , 没闰传回 0
  final private static int leapMonth(int y) {
    return (int) (lunarInfo[y - 1900] & 0xf);
  }

  // ====== 传回农历 y年m月的总天数
  final private static int monthDays(int y, int m) {
    if ((lunarInfo[y - 1900] & (0x10000 >> m)) == 0) return 29;
    else
      return 30;
  }

  // ====== 传回农历 y年的生肖
  final public String animalsYear() {
    final String[] Animals = new String[] { "鼠", "牛", "虎", "兔", "龙", "蛇", "马", "羊", "猴", "鸡", "狗", "猪" };
    return Animals[(year - 4) % 12];
  }

  // ====== 传入 月日的offset 传回干支, 0=甲子
  final private static String cyclicalm(int num) {
    final String[] Gan = new String[] { "甲", "乙", "丙", "丁", "戊", "己", "庚", "辛", "壬", "癸" };
    final String[] Zhi = new String[] { "子", "丑", "寅", "卯", "辰", "巳", "午", "未", "申", "酉", "戌", "亥" };
    return (Gan[num % 10] + Zhi[num % 12]);
  }

  // ====== 传入 offset 传回干支, 0=甲子
  final public String cyclical() {
    int num = year - 1900 + 36;
    return (cyclicalm(num));
  }

  /**
   * 传出y年m月d日对应的农历. yearCyl3:农历年与1864的相差数 ? monCyl4:从1900年1月31日以来,闰月数
   * dayCyl5:与1900年1月31日相差的天数,再加40 ?
   * 
   * @param cal
   * @return
   */
  public LunarCalendar(Calendar cal) {
    this.cal = cal;
    int leapMonth = 0;
    Date baseDate = null;
    try {
      baseDate = chineseDateFormat.parse("1900年1月31日");
    } catch (ParseException e) {
      e.printStackTrace(); // To change body of catch statement use Options |
                           // File Templates.
    }
    // 求出和1900年1月31日相差的天数
    int offset = (int) ((cal.getTime().getTime() - baseDate.getTime()) / 86400000L);
    // 用offset减去每农历年的天数
    // 计算当天是农历第几天
    // i最终结果是农历的年份
    // offset是当年的第几天
    int iYear, daysOfYear = 0;
    for (iYear = 1900; iYear < 2050 && offset > 0; iYear++) {
      daysOfYear = yearDays(iYear);
      offset -= daysOfYear;
    }
    if (offset < 0) {
      offset += daysOfYear;
      iYear--;
    }
    // 农历年份
    year = iYear;
    leapMonth = leapMonth(iYear); // 闰哪个月,1-12
    leap = false;
    // 用当年的天数offset,逐个减去每月（农历）的天数，求出当天是本月的第几天
    int iMonth, daysOfMonth = 0;
    for (iMonth = 1; iMonth < 13 && offset > 0; iMonth++) {
      // 闰月
      if (leapMonth > 0 && iMonth == (leapMonth + 1) && !leap) {
        --iMonth;
        leap = true;
        daysOfMonth = leapDays(year);
      } else
        daysOfMonth = monthDays(year, iMonth);
      offset -= daysOfMonth;
      // 解除闰月
      if (leap && iMonth == (leapMonth + 1)) leap = false;
      if (!leap) {
      }
    }
    // offset为0时，并且刚才计算的月份是闰月，要校正
    if (offset == 0 && leapMonth > 0 && iMonth == leapMonth + 1) {
      if (leap) {
        leap = false;
      } else {
        leap = true;
        --iMonth;
      }
    }
    // offset小于0时，也要校正
    if (offset < 0) {
      offset += daysOfMonth;
      --iMonth;
    }
    month = iMonth;
    day = offset + 1;
  }

  public static String getChinaDayString(int day) {
    String chineseTen[] = { "初", "十", "廿", "卅" };
    if (day == 10) return "初十";
    else
      return chineseTen[day / 10] + chineseDay[day % 10];
  }
  
  public String getStringDay(int day){
    String chineseTen[] = { "", "十", "廿", "卅" };
    return chineseTen[day / 10] + chineseDay[day % 10];
  }

  public String toString() {
    StringBuffer sb = new StringBuffer();
    sb.append(getStringYear(cal.get(Calendar.YEAR)) + "年");
    sb.append(chineseYear[cal.get(Calendar.MONTH)] + "月");
    sb.append(getStringDay(cal.get(Calendar.DATE)) + "日");
    sb.append("星期" + WEEK[cal.get(Calendar.DAY_OF_WEEK)]);
    sb.append("农历" + cyclical() + "年");
    sb.append(chineseNumber[month - 1] + "月");
    sb.append(getChinaDayString(day));
    return sb.toString();
  }
  
  public String getStringYear(int y){
    return chineseYear[y / 1000] + chineseYear[y % 1000 / 100] + chineseYear[y % 100 / 10] + chineseYear[y % 10];
  }

}
